<div class="container">
  <h2>基本表单</h2>
  <form [formGroup]="loginForm">
    <mat-form-field>
      <input matInput formControlName="email" placeholder="email" />
    </mat-form-field>
    <mat-form-field>
      <input matInput formControlName="username" placeholder="username" />
    </mat-form-field>
  </form>
</div>
